Synthetic polyisoprene rubber

Details Synthetic polyisoprene rubber Synthetic polyisoprene rubber

2007-04-03

2007-04-03

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S154000, C502S103000, C502S132000, C502S134000

Reexamination Certificate

active

11287562

ABSTRACT:
The neodymium catalyst system prepared by the technique of this invention can be used in the polymerization of isoprene monomer into synthetic polyisoprene rubber having an extremely high cis-microstructure content and high stereo regularity. This polyisoprene rubber will crystallize under strain and can be compounded into rubber formulations in a manner similar to natural rubber. This invention more specifically discloses a process for the synthesis of polyisoprene rubber which comprises polymerizing isoprene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by a process that comprises (1) reacting a neodymium carboxylate with an organoaluminum compound in an organic solvent to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with an elemental halogen to produce the neodymium catalyst system, wherein the neodymium catalyst system is void of nickel-containing compounds.

REFERENCES:
patent: 3297667 (1967-01-01), Von Dohlen et al.
patent: 3676441 (1972-07-01), Nikles
patent: 3794604 (1974-02-01), Throckmorton et al.
patent: 4242232 (1980-12-01), Sylvester et al.
patent: 4260707 (1981-04-01), Sylvester et al.
patent: 4429089 (1984-01-01), Pedretti et al.
patent: 4444903 (1984-04-01), Carbonaro et al.
patent: 4461883 (1984-07-01), Takeuchi et al.
patent: 4533711 (1985-08-01), Takeuchi et al.
patent: 4663405 (1987-05-01), Throckmorton
patent: 4699960 (1987-10-01), Gordini et al.
patent: 5502126 (1996-03-01), Bell et al.
patent: 5659101 (1997-08-01), Biagini et al.
patent: 5686371 (1997-11-01), Ansell et al.
patent: 6136931 (2000-10-01), Jang et al.
patent: 6255416 (2001-07-01), Sone et al.
patent: 6699813 (2004-03-01), Luo et al.
patent: 6897270 (2005-05-01), Ozawa et al.
patent: 2004/0116638 (2004-06-01), Ozawa et al.
R. P. Quirk, A. M., Kells, K. Yunlu, J.P. Cuif.Polymer41, 5903 (2000).
A. Pross, P. Marquardt, K. H. Reichert, W. Nentwig, T. Knauf,Angew. Makromol. Chem.211, 89 (1993).
H. Iovu, G. Hubca, E. Simionescu, E. Badea, J. S. Hurst,Eur. Polymer J.33, 811 (1997).
H. Iovu, G. Hubca, D. Racoti, J. S. Hurst,Eur. Polymer J.35, 335 (1999).
J. H. Yang, M. Tsutsui, Z. Chen, D. Bergbreiter,Macromolecules15, 230 (1982).
D. J. Wilson,J. Polym. Sci., Part A.33, 2505 (1995).

Affiliated with

Also associated with

Rating

Synthetic polyisoprene rubber does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synthetic polyisoprene rubber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synthetic polyisoprene rubber will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3732307